Evil Cult [latest version]. One of my favorite games. A 4X (explore, expand, exploit, and exterminate) turn-based game with little micro-management so far (I consider this a huge plus).
The developer recently posted a blog update. You can follow him on Twitter. Much development discussion is going on in this thread.
I made two videos of the gameplay: a 5x time lapse and an Let's Play for your pleasure.
Regarding 4x games: There's an ongoing Master of Orion 2 rewrite. Latest activity in the repository: Mon Apr 11 11:55:42 2011 +0200. Here's a custom news feed if you want to follow the project. (I won't be adding custom feeds to the planet for now).
I also created a news feed generator for FreeOrion.